Mońki County (Polish: powiat moniecki) is a unit of territorial administration and local government (powiat) in Podlaskie Voivodeship, north-eastern Poland. It was created on January 1, 1999 as a result of the Local Government Reorganization Act of 1998. Its administrative seat and largest town is Mońki, which lies 40 kilometres (25 mi) north-west of the regional capital Białystok. The county also contains the towns of Knyszyn, lying 13 km (8 mi) south-east of Mońki, and Goniądz, 11 km (7 mi) north-west of Mońki.
The county covers an area of 1,382.39 square kilometres (533.7 sq mi). As of 2006 its total population is 42,960, out of which the population of Mońki is 10,455, that of Knyszyn is 2,835, that of Goniądz is 1,910, and the rural population is 27,760.
The county is subdivided into seven gminas (three urban-rural and four rural). These are listed in the following table, in descending order of population.